2435 results about "Nanofiltration" patented technology

The invention provides a PVDF (Polyvinylidene Fluoride) nanofiltration membrane constructed on the basis of microwave-enhanced bridging interfacial polymerization as well as a preparation method and application of the PVDF nanofiltration membrane. The method comprises the following steps: reacting PVDF powder with an organic alkali to prepare a modified film-forming solution, blade-coating the modified film-forming solution on a non-woven fabric supporting layer, placing the non-woven fabric supporting layer in an ethanol-water or methanol-water coagulating bath, and preparing a PVDF supporting film by virtue of assistance of an ice template; weighing the functionalized nano material and an amino silane coupling agent, performing ultrasonic dispersion, and adding a catalyst for reaction to obtain dispersion liquid; immersing a PVDF support membrane into the dispersion liquid to obtain a modified membrane; immersing the modified membrane into an aqueous solution containing an amine monomer and an organic solution containing an acyl chloride monomer, and carrying out microwave radiation. The interface reaction rate and selectivity are enhanced through the microwave excitation effect, and meanwhile, the hydrophilicity and reaction activity of the PVDF base membrane are cooperatively regulated and controlled, so that the separation efficiency and the anti-pollution capacity of the membrane are remarkably improved. The obtained PVDF nanofiltration membrane has high flux, high selectivity and excellent structural stability, and is suitable for efficient purification and resource recovery application in a complex water system.

The invention discloses a preparation method of a photocatalytic nanofiltration membrane based on IL-GQDs. The method comprises the following steps: pretreating bagasse, and applying the pretreated bagasse and imidazole ionic liquid (IL) to preparation of ionic liquid functionalized graphene quantum dots (IL-GQDs); the IL-GQDs are uniformly distributed on the surface of the base membrane by utilizing a vacuum-assisted low-temperature interfacial polymerization technology to form an ultrathin photocatalytic active layer; and finally, curing and cleaning to obtain the photocatalytic nanofiltration membrane based on the IL-GQDs. According to the prepared IL-GQDs, the membrane surface is endowed with high specific surface area and excellent photocatalytic activity, and meanwhile, an additional water transmission channel can be established under the condition that the pore diameter of the membrane is not changed, so that the problem of trade-off of a traditional membrane is solved. In addition, through combination of low-temperature and vacuum-assisted interfacial polymerization technologies, the membrane structure is more uniform and compact, defects on the surface of the membrane are reduced, and the stability and the anti-pollution capacity of the membrane are improved. The membrane disclosed by the invention shows relatively high water flux, salt recovery rate and long-term stability in water treatment application.

The invention discloses a preparation method of a crown ether functionalized anti-pollution nanofiltration membrane, which comprises the following steps: soaking a membrane of a commercial nanofiltration membrane in pure water, and coating the surface with a double-end epoxy compound ethanol solution; uniformly coating the surface of the membrane with an aza 12-crown-4 methanol solution; and drying the membrane in an atmosphere of 40-90 DEG C to obtain the crown ether functionalized anti-pollution nanofiltration membrane. The nano-filtration membrane is realized by chemically grafting aza 12-crown-4 on the membrane surface of a commercial nano-filtration membrane by utilizing a double-end epoxy compound; compared with a traditional nanofiltration membrane, the crown ether functionalized nanofiltration membrane provided by the invention has the advantages that the electronegativity of the surface is reduced, and the surface is similar to an aquatic plant molecular brush structure, so that the deposition of pollutants on the surface of the membrane can be effectively improved, and the anti-pollution performance of the membrane is enhanced; meanwhile, due to the complexing effect of 12-crown-4 molecules on lithium ions, the lithium ions can be effectively captured, concentration polarization of the lithium ions on the surface of the diaphragm is improved, and then the magnesium-lithium separation efficiency of the diaphragm is improved.

The invention provides a method and system for salt separation, evaporation and crystallization of printing and dyeing wastewater, and the method comprises the following steps: sequentially carrying out multi-stage synergistic pretreatment on textile printing and dyeing wastewater to remove suspended solids, degrade organic matters and reduce hardness; the pretreated wastewater is subjected to membrane salt separation treatment, and preliminary separation of salt is achieved through reverse osmosis pre-concentration and nanofiltration salt separation; and respectively carrying out evaporative crystallization treatment on the separated high-concentration salt solution to obtain high-purity sodium sulfate and sodium chloride products. According to the method, the salt recovery rate and the product purity are remarkably improved, the energy consumption and the operation cost are reduced, meanwhile, the problems that in traditional printing and dyeing wastewater treatment, salt is difficult to separate, and the crystallization purity is low are solved, and an innovative solution is provided for high-valued resource recovery of industrial wastewater.

The invention provides a high-flux chlorine-resistant anti-pollution composite nanofiltration membrane and a preparation method and application thereof, and the preparation method comprises the following steps: immersing a porous base membrane into a water-phase monomer solution, taking out the porous base membrane, removing a surface solution, and immersing the porous base membrane into an organic-phase monomer solution to complete interfacial polymerization to obtain an initial polyamide active layer; immersing the prepared initial polyamide active layer in a mixed solution containing sodium lignin sulfonate, a surfactant and a catalyst to complete surface modification; and carrying out thermocuring on the prepared surface-modified polyamide active layer to obtain the high-flux chlorine-resistant anti-pollution composite nanofiltration membrane. The anti-pollution performance and water flux of the prepared composite nanofiltration membrane are obviously improved, the composite nanofiltration membrane is suitable for being used as drinking water terminal treatment, and softening and purification of drinking water are achieved.

The invention relates to the technical field of industrial production wastewater treatment, and particularly provides a resource utilization method of calcium chloride high-salt water containing high-concentration organic matters. The method comprises the steps of pretreatment, wet catalytic oxidation, salt type conversion, softening filtration, deep oxidation, nanofiltration purification and targeted adsorption, no residual mother liquor exists, no secondary pollution is generated, organic matters in effluent are stable and reach the standard, the water quality and water quantity fluctuation resistance is high, heterogeneous and homogeneous catalysts are combined for catalysis, and the purification effect is good. According to the method, the sodium chloride solution is used as a raw material, the homogeneous catalyst is recycled, in addition, most of salt in the homogeneous catalyst is also recycled, resource reutilization is fully achieved, the treatment cost is reduced, and the treated sodium chloride solution can be used as primary saline water for subsequent ion membrane electrolysis.

The invention discloses a printing and dyeing wastewater advanced treatment and salt control recycling process and system, and belongs to the technical field of wastewater treatment. According to the process, the printing and dyeing wastewater is sequentially subjected to pretreatment of grating interception, adjustment and homogenization, and coagulating sedimentation; carrying out hydrolytic acidification and biochemical treatment in a membrane bioreactor; softening treatment of ozone oxidation complex breaking and fluidization crystallization softening; carrying out nanofiltration separation to obtain a permeate and a concentrated solution; carrying out seed crystal fluidization descaling on the concentrated solution; respectively carrying out membrane concentration on the nanofiltration permeate and the descaled concentrated solution through reverse osmosis to obtain sodium chloride and sodium sulfate concentrated solutions; and finally, carrying out evaporation curing treatment on the sludge and the crystallized waste residues. Through multi-step cooperative treatment, deep purification of the printing and dyeing wastewater and efficient separation and recycling of salt are realized, and the problems of impure nanofiltration salt separation and high system scaling risk in the prior art are solved.

The invention discloses a surface-enhanced tryptophan modified nanofiltration membrane as well as a preparation method and application thereof. Belongs to the field of water treatment membrane preparation. The invention aims to solve the technical problems of non-uniform pore size distribution and surface hydrophobicity of the conventional nanofiltration membrane. The method comprises the following steps: adding tryptophan into a piperazine water-phase solution, and carrying out interfacial polymerization with oil-phase trimesoyl chloride to prepare the tryptophan modified nanofiltration membrane. According to the preparation method, the diffusion rate of the piperazine monomer can be adjusted in the interfacial polymerization process by utilizing a similar surfactant structure of tryptophan, meanwhile, the tryptophan has hydrophilicity and can improve the hydrophilicity of the surface of an active layer, and the prepared modified nanofiltration membrane is reduced in molecular weight cut-off, improved in surface hydrophilicity and good in water resistance. The retention rate of organic micro-pollutants is improved, and meanwhile, good anti-pollution performance is achieved.

The invention discloses a printing and dyeing wastewater zero-discharge treatment process based on low-pressure high-power membrane concentration and salt separation synergy. The wastewater is sequentially subjected to the steps of double-alkali softening pretreatment, organic pollutant treatment, forward osmosis low-pressure high-power concentration treatment, salt separation treatment and evaporative crystallization. Wherein the forward osmosis low-pressure high-power concentration treatment is performed in a partitioned manner along the flow direction, the osmotic pressure difference is gradually increased, the transmembrane pressure difference is gradually decreased, and interface electrochemical buffer and low-frequency gas-liquid disturbance can be set to inhibit concentration polarization and pollution. Carrying out nanofiltration and salt separation on the concentrated solution to obtain two paths of saline water mainly comprising Na2SO4 and NaCl, and respectively carrying out evaporative crystallization on the two paths of saline water; and refluxing and reusing the water produced by the draw solution. According to the process, high-power concentration and stable salt separation are realized under low mechanical pressure, the energy consumption is reduced, the water recovery rate and the crystal purity are improved, and zero discharge of wastewater is realized.

The invention relates to the technical field of water treatment equipment, in particular to a coaxial nested ultrafiltration and nanofiltration integrated water purification device and system.The coaxial nested ultrafiltration and nanofiltration integrated water purification device comprises a main shell, and an annular ultrafiltration treatment area and an inner nanofiltration treatment area are coaxially arranged in the main shell. An energy storage adjusting assembly is arranged in the nanofiltration treatment area and comprises an elastic breathing sleeve coaxially arranged outside the nanofiltration membrane assembly in a sleeving mode. The sleeve elastically expands during filtering, so that the effects of buffering pressure and storing energy are achieved; and turbulent flow convex ribs can be arranged on the inner wall of the sleeve, so that the nanofiltration membrane is physically cleaned when the sleeve retracts. Besides, a backwashing pipeline and a valve are arranged, linkage control is carried out when the control unit detects that expansion of the sleeve exceeds the limit, and ultrafiltration produced water stored on the nanofiltration side is reversely pushed by utilizing pressure energy released by retraction of the sleeve so as to backwash an ultrafiltration membrane. According to the invention, the cooperation of pressure buffering, online cleaning of the nanofiltration membrane and energy storage backwashing of the ultrafiltration membrane is realized, the operation is stable, the efficiency is high, and the energy is saved.

The present invention provides a system and method for extracting lithium from salt lake brine and preparing battery-grade lithium carbonate. The system includes a coagulation and precipitation system, a filtration system, an adsorption and desorption system, a calcium and magnesium removal system, a boron removal system, a concentration system, an evaporation system, and a lithium precipitation system connected in sequence. The calcium and magnesium removal system includes a first-stage reverse osmosis concentration unit, a first-stage nanofiltration calcium and magnesium removal unit, a second-stage reverse osmosis concentration unit, a multi-stage nanofiltration calcium and magnesium removal unit, and a calcium and magnesium ion exchange unit connected in sequence. The boron removal system includes a first-stage nanofiltration boron removal unit, a multi-stage nanofiltration boron removal unit, and a boron ion exchange unit connected in sequence. After the lithium precipitation system, there are also a precision filtration system and a water washing and drying system connected in sequence. By adopting the process of the present invention, the lithium recovery rate is improved, and the product is battery-grade lithium carbonate, greatly improving the resource utilization and recovery rate of the lithium extraction system, reducing the amount of externally added water and the consumption of sodium carbonate in the process of the lithium precipitation system.

The application provides application of a temperature-sensitive composite material in preparation of a separation membrane, a nanofiltration membrane and a preparation method, and particularly relates to the technical field of separation membranes. The temperature-sensitive composite material comprises a temperature-sensitive material and conductive fillers. The mass ratio of the temperature-sensitive material and the conductive fillers is 10-30:1-10. The application utilizes the characteristic that the temperature-sensitive material quickly responds to temperature changes, and the temperature-sensitive material transmits to the outside world through the conductive fillers, so that timely feedback and adjustment of the temperature in the preparation process of the separation membrane are realized, the isotropic separation membrane is prepared, the stability of the performance of the separation membrane is ensured, and the quality of the separation membrane product is improved.

The invention relates to a high-activity feather hydrolyzed amino acid water-soluble fertilizer and a preparation method thereof. The preparation method comprises the steps of pretreatment, complex enzyme stepped hydrolysis, nanofiltration separation, chelation and stabilization, spray drying and the like. Feather keratin is hydrolyzed step by step through a compound enzyme, small molecule peptide and amino acid are separated in combination with a nanofiltration membrane, trace elements are added for chelation, and a drying process is optimized, so that the activity and stability of the fertilizer are remarkably improved. The feather keratin can be efficiently degraded, the problem of amino acid racemization caused by a traditional strong acid / alkali method is solved, meanwhile, energy consumption is reduced, and the requirements of modern agriculture for environment-friendly and efficient fertilizer are met.

The invention relates to an aquaporin bionic nanofiltration membrane and a preparation method and application thereof.The aquaporin bionic nanofiltration membrane is composed of a cell sheet rich in aquaporin and a porous base membrane, and the cell sheet rich in aquaporin serves as a functional unit; through a vacuum filtration method, layer-by-layer assembly and cross-linking curing, the bonding firmness in the active layer is improved. The preparation method disclosed by the invention is simple in operation process, the embedding amount of the aquaporin in the nanofiltration membrane is increased, and the biological activity of the aquaporin is ensured. The aquaporin bionic nanofiltration membrane disclosed by the invention is high in stability and excellent in permeation selectivity, and has a wide application prospect in the field of membrane separation.

The utility model belongs to the technical field of sugar alcohol preparation, and relates to a system for co-producing L-arabinose and caramel pigment by using xylose chromatography raffinate, which comprises a raw material tank, a nanofiltration membrane separator, a chromatography separation device, an evaporation concentration tank, a crystallization tank, a centrifugal separator and a dryer which are sequentially communicated by pipelines, and the browning reaction assembly is used for mixing the raffinate and the centrifugal mother liquor and then carrying out browning reaction treatment to prepare caramel pigment. The chromatographic separation device is used for separating an extracting solution and raffinate from the flowing nanofiltration permeate, the evaporation concentration tank and the crystallizing tank are used for concentrating and crystallizing the flowing extracting solution into massecuite, the centrifugal separator is used for separating the flowing massecuite into moist sugar and centrifugal mother liquor, and the dryer is used for drying the flowing moist sugar into L-arabinose crystals. According to the utility model, raffinate and centrifugal mother liquor are mixed to prepare a caramel pigment liquid product, so that a caramel pigment additional product is obtained while the utilization rate of saccharide resources is improved.

The invention relates to the technical field of membrane separation, in particular to a preparation method of a pH-step-by-step thermocuring regulation sodium-magnesium separation nanofiltration membrane. The method comprises the following steps: (1) pre-treating a base membrane; (2) preparation and treatment of an aqueous phase solution: S1, preparing the aqueous phase solution according to mass fraction: sequentially adding 1.2%-1.6% of piperazine, 0.10%-0.14% of triaminopyrimidine and 0.14%-0.18% of polyethylene glycol into deionized water, and stirring until the piperazine, the triaminopyrimidine and the polyethylene glycol are completely dissolved to form the aqueous phase solution; s2, adjusting the pH value of the water-phase solution to 10-11 by using hydrochloric acid; s3, pouring the water-phase solution of which the pH is adjusted on the surface of the pretreated base membrane, standing, and blow-drying to form a uniform water-phase layer; (3) interfacial polymerization reaction: S1, preparing an oil phase solution: adding 0.10-0.14% of trimesoyl chloride into n-hexane, and performing ultrasonic treatment until the trimesoyl chloride is completely dissolved; s2, pouring the oil-phase solution on the surface of the base membrane subjected to water-phase treatment, and after reaction, pouring out redundant solution to form a polyamide separation layer, so as to obtain a membrane sheet; (4) performing a step-by-step thermocuring process; and (5) cleaning and storing.

The invention discloses a preparation method of a crocodile hydrolyzed protein zinc skin care product, and relates to the technical field of skin care. The method comprises the following steps: step a, pretreating raw materials: taking fresh crocodile meat and bones, cleaning, mechanically crushing until the particle size is less than 5mm, and adding water according to the ratio of 1: (3-5) to prepare homogenate; step b, performing three-step enzymolysis, namely performing enzymolysis by adopting alkaline protease, flavourzyme and zinc chelating enzyme in sequence; according to the constructed technology of three-step enzymolysis and three-stage membrane separation, accurate preparation of crocodile protein zinc is achieved, and the zinc chelating rate is increased to 90% or above through the gradient effect of alkaline protease, flavourzyme and zinc chelating enzyme and directional release of zinc binding sites and is remarkably higher than that of a traditional single-enzyme hydrolysis technology; meanwhile, a combined purification technology of a ceramic membrane, an ultrafiltration membrane and a nanofiltration membrane is adopted to replace chemical precipitation and organic solvent extraction, so that the completeness of active ingredients is reserved, the risk of environmental pollution is reduced, and the method conforms to the green manufacturing trend of food industry.

The invention provides a preparation method of a high-flux stable-selection anti-fouling nanofiltration membrane, which comprises the following steps: carrying out amination modification on a nano material by an activation method to prepare a modified nano material; piperazine, an acid absorbent and the modified nano material are added into deionized water to be mixed, and a water phase solution is prepared; the preparation method comprises the following steps: mixing trimesoyl chloride and normal hexane to prepare an organic phase solution; immersing the polyethersulfone-based membrane into the water phase solution, draining, inversely immersing into the organic phase solution, and carrying out interfacial polymerization reaction to generate a polyamide layer to obtain a composite membrane; and then carrying out post-treatment on the composite membrane to obtain the composite membrane. The membrane has high permeability, high selectivity and strong anti-pollution performance.

The invention discloses a preparation method of a solvent-resistant nanofiltration membrane with a polydopamine / amino silicon dioxide middle layer, belongs to the technical field of membrane separation, and solves the technical problems of low flux and poor stability of the solvent-resistant nanofiltration membrane. The preparation method of the solvent-resistant nanofiltration membrane with the polydopamine / amino silicon dioxide middle layer comprises the following steps: preparing a polyetherimide-based membrane by a phase inversion method-crosslinking method; preparing amino silicon dioxide nanoparticles by adopting a sol-gel method; preparing a deposition solution containing dopamine, an oxidizing agent and amino silicon dioxide by using a Tris buffer solution; depositing the polydopamine / amino silicon dioxide intermediate layer on the upper surface of the polyetherimide base film; carrying out interfacial polymerization reaction of piperazine and trimesoyl chloride on the surface of the membrane deposited with the middle layer, and carrying out heat treatment to obtain a composite membrane; and immersing the composite membrane into an organic solvent for activation to obtain the solvent-resistant nanofiltration membrane with a polydopamine / amino silicon dioxide intermediate layer. The solvent-resistant nanofiltration membrane constructed by taking polyetherimide as a base membrane, polydopamine / amino silicon dioxide as a middle layer and polyamide as a separation layer has excellent flux and stability, and has a wide application prospect in the aspects of drug separation, organic solvent recovery and the like.

The invention belongs to the technical field of membrane separation, and particularly relates to a recrystallized silicon carbide ceramic nanofiltration membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: applying a polycarbosilane solution to a silicon carbide ceramic ultrafiltration body, and carrying out first pyrolysis to obtain a pyrolysis material; a polycarbosilane solution is applied to the pyrolysis material, and then second pyrolysis is carried out; the first pyrolysis process comprises the following steps: heating to 290-310 DEG C from room temperature, and preserving heat; raising the temperature from 290-310 DEG C to 790-810 DEG C, and keeping the temperature; raising the temperature from 790 to 810 DEG C to 1190 to 1210 DEG C, and keeping the temperature; the second pyrolysis comprises first pyrolysis and recrystallization which are carried out in sequence; the recrystallization process comprises the following steps: heating from 1190-1210 DEG C to 1590-1610 DEG C, and preserving heat; the temperature is increased to 2190-2210 DEG C from 1590-1610 DEG C, and heat preservation is conducted. The aperture of the recrystallized silicon carbide ceramic nanofiltration membrane is smaller than 10 nm, and nanofiltration can be achieved.

The invention provides a composite nanofiltration membrane as well as a preparation method and application thereof, and the preparation method comprises the following steps: reacting a water phase solution and an oil phase solution on the surface of a base membrane to obtain a primary composite nanofiltration membrane; wherein the water phase solution contains piperazine and polyacrylamide, and the oil phase solution contains trimesoyl chloride. The nanofiltration membrane provided by the invention is high in pure water flux, good in membrane surface hydrophilicity, strong in pollution resistance, high in mechanical strength and durability, low in cost and capable of stably running for a long time.

This invention relates to a method for preparing a p-aminobenzenesulfonic acid blended nanofiltration membrane and its application. The invention aims to address the technical problem that existing polymer thin films struggle to simultaneously increase permeate flux while improving retention rate. This invention provides a nanofiltration membrane with high efficiency in separating cobalt and lithium ions and significantly enhanced permeate flux. It achieves this by doping p-aminobenzenesulfonic acid during the preparation of traditional TFC nanofiltration membranes, efficiently introducing sulfonic acid groups to promote the formation of an ordered nanochannel structure in the polyamide network, thereby increasing water flux. Simultaneously, the negative charge carried by the sulfonic acid groups enhances the overall electronegativity of the membrane, making it more effective against Co ions. 2+ The electrostatic adsorption capacity is significantly higher than that of Li + This enables efficient separation of cobalt and lithium ions. The nanofiltration membrane material provided by this invention can be widely used in the resource-based treatment of acid leaching wastewater from lithium cobalt oxide batteries, achieving efficient separation and recovery of cobalt and lithium, and improving economic benefits and resource utilization.

The invention provides an intelligent maintenance cleaning device for nanofiltration membrane pollution control and a method thereof, and solves the problems of low maintenance cleaning efficiency, poor adaptability of cleaning parameters and pollution conditions and frequent chemical cleaning of an existing nanofiltration system. Belongs to the technical field of membrane pollution control. According to the invention, the filtering system, the cleaning system and the intelligent decision-making module are integrally designed, so that the closed-loop control of the whole process of real-time monitoring, pollution identification, intelligent decision-making and automatic cleaning of the running state of the nanofiltration membrane is realized. The cleaning effect gating memory neural network model is used as a membrane pollution prediction model, membrane pollution can be accurately predicted, and key cleaning nodes can be identified. The optimal membrane cleaning parameters are generated by adopting a non-dominated sorting genetic algorithm, the usage amount of chemical agents and the cleaning cost are reduced, and the membrane pollution control effect is improved. The invention is applicable to the field of drinking water treatment.

The invention relates to a treatment method and device for resource utilization of desulfurization wastewater in the technical field of desulfurization wastewater treatment, and the device comprises a pretreatment module, a magnesium removal module, a calcium removal module, a nanofiltration salt separation module, a concentration reduction module and a flue evaporation module, the method comprises the steps of pretreatment, magnesium removal treatment, calcium removal treatment, nanofiltration salt separation treatment, evaporative crystallization treatment and the like, heavy metals and suspended solids in the desulfurization wastewater are removed in the pretreatment module, a high-purity magnesium hydroxide product is extracted through the magnesium removal module, after calcium ions are removed in the calcium removal module, salt separation treatment is conducted through the nanofiltration salt separation module, and the high-purity magnesium hydroxide product is obtained. One part of the separated monovalent saline water is recycled, the other part of the separated monovalent saline water is concentrated and reduced by the concentration and reduction module and then enters the flue evaporation module to be evaporated, and the separated divalent saline water is recycled to a desulfurization system. The method has the advantages of simplicity and convenience in operation, economical operation, environment-friendly process and the like, high-purity magnesium hydroxide can be recycled, complete zero emission of the desulfurization high-chlorine wastewater is realized, and the method has a relatively high commercial application value.

The invention relates to a bionic strong acid-resistant nanofiltration membrane and a preparation method thereof, and the bionic strong acid-resistant nanofiltration membrane comprises a porous support layer and an active separation layer formed on the surface of the porous support layer, the active separation layer is a polymer network layer formed by carrying out interfacial polymerization reaction on a water-phase solution containing polyamine and an oil-phase solution containing polyacyl chloride on the surface of the porous support layer. The water-phase solution and / or the oil-phase solution also contains a bionic amphiphilic phosphate compound, the bionic amphiphilic phosphate compound participates in interfacial polymerization reaction through an active functional group in a molecular structure of the bionic amphiphilic phosphate compound, and the phosphate structure of the bionic amphiphilic phosphate compound is covalently connected into a skeleton of the polymer network layer. The preparation method has the beneficial effects that the bionic amphiphilic phosphate compound with a hydrophilic phosphate head, a hydrophobic alkyl tail and a reaction site is synthesized, so that the bionic amphiphilic phosphate compound is spontaneously and orderly arranged on a water / oil interface and participates in interfacial polymerization, the film forming uniformity is improved, the pore size distribution is narrowed, and the intelligent response characteristic is given to the film.

The invention discloses a seawater all-component efficient separation system based on intelligent regulation and control, and relates to the technical field of seawater treatment. Full-flow closed-loop control from original seawater sample collection, multi-parameter water quality monitoring, ion concentration detection, component identification and path prediction, confinement nanofiltration and air flotation impurity removal, temperature control degassing and ion threshold separation, high-value ion enrichment and multi-path extraction to real-time feedback regulation is realized; through self-adaptive generation of a separation path and precise adjustment of process parameters, the problems that a traditional seawater resource extraction method is poor in component adaptation capacity, high in energy consumption, poor in target object selectivity and the like are solved, the whole separation system remarkably improves the extraction efficiency and selectivity of trace high-value ions, and the separation efficiency is improved. The operation energy consumption and the human intervention degree are reduced, and the system has the remarkable advantages of modular structure, intelligent operation and wide application scene.

The invention belongs to the technical field of nanofiltration, and provides a preparation method of a recrystallized silicon carbide-silicon carbonitride ceramic membrane. The preparation method comprises the following steps: applying a polysilazane solution to a porous substrate for the first time, and then performing first pyrolysis to obtain a pyrolysis material; and applying a polysilazane solution on the pyrolysis material for the second time, and then carrying out second pyrolysis to obtain the recrystallized silicon carbide-silicon carbonitride ceramic membrane. According to the invention, a solution containing propargyl polysilazane or organic polysilazane Durazane 1500 quick-drying resin is used as a precursor to prepare the ceramic membrane, and the ceramic membrane has the advantages of high ceramic yield, excellent high-temperature stability, high retention rate and controllable microstructure, and is suitable for separation and protection application in extreme environments.

The invention provides a chlorine-resistant high-flux salt lake lithium extraction separation membrane and a preparation method, and belongs to the technical field of salt lake lithium extraction membrane separation.The preparation method specifically comprises the following steps that 1, a hollow fiber base membrane is prepared, specifically, a polymer, a solvent and an additive are mixed to form a membrane casting solution, and the hollow fiber base membrane is prepared through a spinning technology; step 2, modifying a piperazine monomer, and reacting the piperazine monomer with bis (2-chloroethyl) amine to generate a piperazine monomer with a spiral structure; 3, interfacial polymerization: the base membrane is sequentially immersed in a modified piperazine monomer solution and a trimesoyl chloride (TMC) solution for interfacial polymerization reaction, a thin spiral net structure functional separation layer is formed, and the formed nanofiltration membrane has the performance of chlorine resistance, high flux, high selective separation and the like. The key problems of low Mg < 2 + > / Li < + > separation efficiency, poor chlorine resistance of the membrane, insufficient flux and the like in lithium extraction from the salt lake are solved, the lithium recovery rate is remarkably increased, and the service life of the membrane is remarkably prolonged.

The invention belongs to the technical field of membrane separation, and particularly relates to a method for preparing a high-flux hollow fiber nanofiltration membrane based on interfacial polymerization, the obtained membrane and application. The method comprises the following steps: firstly, carrying out pre-adsorption treatment on a polyethersulfone hollow fiber ultrafiltration base membrane through a polyethyleneimine aqueous solution to form a reactive anchoring layer; then sequentially dipping in an aqueous phase solution containing piperazine, sodium phytate and nanoscale cellulose whiskers and an organic phase solution containing trimesoyl chloride and 5-isocyanate isopeptide acyl chloride for interfacial polymerization; and finally, carrying out heat treatment on the obtained primary composite membrane, and completing a gas-phase cross-linking reaction in a glutaraldehyde steam atmosphere. According to the method, the hollow fiber nanofiltration membrane with high flux, high selectivity, excellent chlorine resistance and pollution resistance is successfully prepared through a multi-stage strengthening process, and the hollow fiber nanofiltration membrane is suitable for the fields of drinking water purification, industrial wastewater reuse, material separation and the like.

The invention discloses a crown ether modified nanofiltration membrane for selective separation of lithium and magnesium and a preparation method of the crown ether modified nanofiltration membrane, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: by taking a porous ultrafiltration membrane as a substrate and 2-aminomethyl-18-crown-6 ether and polyamine as water-phase monomers, carrying out interfacial polymerization reaction on the water-phase monomers and trimesoyl chloride on the surface of the porous ultrafiltration membrane to form a polyamide layer; wherein 2-aminomethyl-18-crown-6 ether is introduced into the polyamide separation layer in the form of a covalent bond through a reaction with trimesoyl chloride. The prepared nanofiltration membrane can effectively intercept Mg < 2 + > and provide an exclusive transport channel for Li < + >, so that the Li < + > smoothly crosses the membrane, and the lithium-magnesium separation effect is achieved. The method is simple in preparation process operation, low in energy consumption and easy to amplify, can be used for salt lake lithium extraction, and has a wide industrial application prospect.